JPS5842873Y2 - Raw material diffusion plate for powder raw material firing equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a raw material diffusion plate in a firing device for powdered raw materials such as cement raw materials.

Among conventional cement raw material firing apparatuses, those equipped with a calcining furnace have a configuration as shown in FIG. 1, for example.

In other words, in Fig. 1, the solid arrows indicate the flow of gas,
Dotted arrows indicate the flow of raw materials.

Further, in the figure, 10 is a suspension preheater, 30 is a calcining furnace 40, which is a rotary kiln, and 50 is a clinker cooler.

Then, the powdered raw material is introduced into the duct 12 from the raw material supply device 11, suspended in the hot gas coming from below, and introduced into the first stage cyclone 13 while exchanging heat, where it is collected and falls to the lower stage through the chute 14. , and so on, duct 15
→Second stage cyclone 16→Chute 17→Duct 18→
Flowing down while exchanging heat with the third stage cyclone 19,
It is preheated to about 700°C and calcined (decarboxylated) to about 10%.

The powder raw material collected by the third stage cyclone 19 is then introduced into the riser duct 31 through the chute 20, carried by the kiln exhaust gas, and introduced into the calciner 30. After being calcined to a certain degree, it is collected by a separation cyclone 22 through a duct 21 and introduced into a rotary kiln 40 through a chute 23.

The calcined raw material is burned into clinker by a burner 41 in a rotary kiln 40, and is cooled by a clinker cooler 50 to become a product.

However, the conventional device shown in FIG. 1 has a drawback in that the coating tends to adhere to the lower part of the rising duct 31, and this will be explained using enlarged views in FIGS. 2 and 3.

The powder raw material preheated by the suspension preheater 10 slides out from the chute 20 onto the diffusion plate 33 and rides on the kiln exhaust gas, but some of it hits the wall opposite the diffusion plate 33, falls down the wall, and is carried away by the kiln exhaust gas again. Float.

For this reason, as shown in the figure, since there is no raw material near the wall directly below the diffusion plate 33, the temperature of the exhaust gas is high, and the coating 34 tends to adhere, making long-term continuous operation impossible without cleaning.

In the present invention, by drilling an appropriate number of holes of appropriate size in the middle of the raw material diffusion plate, a part of the raw material is forced to fall, thereby preventing coating from adhering to the lower side wall of the diffusion plate. An example of this will be described with reference to FIGS. 4 and 5.

In FIGS. 4 and 5, 35 is a hole provided in the diffusion plate 33. In FIG.

That is, a hole 3 of an appropriate size is formed in the middle part of the diffusion plate 33.
5 is opened, most of the powder raw material that slides down the chute 20 slides on the upper part of the diffusion plate 33 and floats in the kiln exhaust gas as before, and the remaining part passes through the hole 35 on the diffusion plate 33. It passes through and falls directly below the diffusion plate 33, and is suspended by the kiln exhaust gas.

In this way, the raw material is also supplied to the vicinity of the lower side wall of the diffusion plate 33 and the exhaust gas temperature is lowered, thereby making it possible to prevent coating from adhering.

Therefore, in the present invention, appropriate holes are provided in the raw material diffusion plate, which is provided so that the powdered raw material can easily float in the kiln exhaust gas, so that the coating adheres to the lower part of the kiln riser duct, especially on the wall directly below the diffusion plate. This prevents coating growth and enables long-term continuous operation without cleaning work.

[Brief explanation of drawings]

Figure 1 is an elevation view of a conventional cement raw material sintering device;
The figure is an enlarged longitudinal cross-sectional view of the rising duct in Figure 1, Figure 3 is a plane cross-sectional view taken along section line A-A in Figure 2, and Figure 4 is an illustration of the present invention corresponding to Figure 2. A sectional view of the embodiment, FIG. 5 is a sectional view taken along the cutting line BB in FIG. 4. 10... Suspension preheater, 20...
... Chute, 30 ... Calciner, 31 ...
...Rising duct, 33... Diffusion plate, 35
...hole, 40 ... rotary kiln.

Claims (1)

[Scope of utility model registration request] Suspension preheater firing equipment that suspends powdered raw material preheated by a suspension preheater in kiln exhaust gas and heats the raw material with the heat retained in the exhaust gas, or suspends powdered raw material in kiln exhaust gas and then introduces it into a calcining furnace. In a suspension preheater firing device with a calciner for pre-combustion, a raw material diffusion plate is provided so that the powdered raw material is easily suspended in the kiln exhaust gas, and a part of the raw material passes through and falls to form a coating that adheres to the lower side wall. A raw material diffusion plate for a powder raw material firing device, which is equipped with an appropriate number of holes to prevent